netdev - [PATCH bpf-next v3 0/2] xsk: introduce pre-allocated memory per xsk CQ

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Message-Id: <20260104032313.76121-1-kerneljasonxing@gmail.com>
Date: Sun,  4 Jan 2026 11:23:11 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	bjorn@...nel.org,
	magnus.karlsson@...el.com,
	maciej.fijalkowski@...el.com,
	jonathan.lemon@...il.com,
	sdf@...ichev.me,
	ast@...nel.org,
	daniel@...earbox.net,
	hawk@...nel.org,
	john.fastabend@...il.com
Cc: bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	Jason Xing <kernelxing@...cent.com>
Subject: [PATCH bpf-next v3 0/2] xsk: introduce pre-allocated memory per xsk CQ

From: Jason Xing <kernelxing@...cent.com>

This series was made based on the previous work[1] to fix the issue
without causing too much performance impact through adding a
pre-allocated memory for each xsk.

[1]: commit 30f241fcf52a ("xsk: Fix immature cq descriptor production")

---
v3
link: https://lore.kernel.org/all/20251216052623.2697-1-kerneljasonxing@gmail.com/
1. fix double free of lcq in xsk_clear_local_cq()
2. keep lcq->prod align with cq->cached_prod, which can be found in
xsk_cq_cancel_locked().
3. move xsk_clear_local_cq() from xsk_release() to xsk_destruct() to
avoid crash when using lcq in xsk_destruct_skb() after lcq is already freed.

v2
link: https://lore.kernel.org/all/20251209085950.96231-1-kerneljasonxing@gmail.com/
1. add if condition to test if cq is NULL
2. initialize the prod of local_cq


Jason Xing (2):
  xsk: introduce local_cq for each af_xdp socket
  xsk: introduce a dedicated local completion queue for each xsk

 include/net/xdp_sock.h |   8 ++
 net/xdp/xsk.c          | 222 +++++++++++++++++++++--------------------
 2 files changed, 122 insertions(+), 108 deletions(-)

-- 
2.41.3